August wiedenfeld



No. 749,123. I PATENTED JAN. 5, 1904.

' A. WIEDENPELD. MAGNETIC LOCK FOR MINERS' SAFETY LAMPS.

N0 MODEL.

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. ing of such lamps.

UNITED STATES Patented January 5, 1904.

PATENT OFFICE.

AUGUST WI'EDEN'FELD, OF BOOHUM, GERMANY.

SPECIFICATION forming part of Letters Patent No. 749,123, dated January 5, 1904.

Application filed January 30.1903- Serial No. 141,166. (No model.)

To all whom it may concern:

Be it known that I, AUGUST WIEDENFELD, a citizen of the German Empire, and a resident of Bochum, Nestphalia, Germany, have invented certain new and useful Improvements in Magnetic Looks for Miners Safety- Lamps, of which the following is a specification.

My invention relates to improvements in looks of miners safety-lamps; and its object is the prevention of an unauthorized open- I attain this object by providing in the lock of the lamp a certain distribution of the volume of the bolt at both sides of its swinging center involving a concentration of the inertial energies uniting to a central power in a support below the center of said bolt, so that a stroke against the lamp will merely result in an equable resistance of the bolt owing to the equable distribution of its volume. Besides, my lock is so constructed in contrast with the bolts bearing round a pivot or axis that the bolt cannot turn round nor disjoin. Another advantage is the lateral insertion of the locking device in the magnetic lamp-lock, which permits access to and a removal of the bolt only when the lamp is open. The unlocking of the lamp is done by indirect magnetization of the bolt from an iron core fastly inserted in abrazen screw-ring.

My invention is illustrated by the drawings herewith.

Figure 1 is a view of a lamp vessel, the portion of the latter which is covered by my invention being pointedout in dotted lines. Fig. 2 is a ground plan of the vessel. Figs. 3 and 4 illustrate two different ways of arranging the bolt and two forms in which my invention may be carried out.

The bolt a of the lock is provided with a tooth b and is placed in a cavity 01 in the side of the vessel, in abrass screw-ring. A spring f keeps the said bolt at in the position illustrated in Fig. 1. Within the above-mentioned brazen screw-ring g there is lodged an iron core e. On approaching the latter with a magnet in the direction indicated on the drawings by an arrow it will attract the bolt and will by the flexibility of the spring f cause the end of the bolt, which is provided with the'teeth b, to precede and disengage aforesaid bolt may be removed when the lamp is open, so that the spring can be looked after and the lock kept in proper order.

Inthe examples illustrated by Figs. 3 and 4 the iron core 6 and the bolt a are both inserted in the screw-ring g. This arrange; ment ofiers the advantage that it permits, by means of several notches m in the vessel, a screwing on or turning tighter of the screwring when the thread of the latter wears out by continuous use of the lamp. In order to prevent a dropping out of the bolt when the lamp is being opened, a hole is provided in the bolt, catching a pivot h, screwed into the ring. When the lamp is closed, the bolt is not supp0rted,however,by the pivot,the latter on account of the larger size of the hole It exercising no efiect whatever on the bolt except that it catches the bolt, and thus prevents its dropping out when the lamp is being opened.

Fig. 4 shows an example where the bladespring f is substituted by a spiral spring Z, catching into a recess in the bolt and keeping it locked. The effect is the same as with the other arrangements above described. A plate t, soldered to at the top, covers the bolt 0,. The bottom is is provided with a perforation to admit the tooth b of the bolt.

What I claim as my invention, and desire to protect by Letters Patent, is

1. In magnetic locks for minors safetylamps, the combination with the casing of the lamp, of a bolt swinging ona point below the horizontal center and substantially at mid-length whereby the volume of the bolt is distributed in substantially equal parts on both sides of said swinging point, substantially as described.

2. In magnetic locks for miners safetylamps, the combination of a spring-pressed bolt, of a brass screw-ring provided with a perforation in which is seated an iron core above one end of the bolt, the other end of the bolt being adapted to engage in a notch in said ring;

3. In magnetic locks for minors safety- In testimony whereof Ihave herennto subscribed my name in the presence of two witto nesses.

AUGUST WIEDENFELD.

Witnesses WILLIAM ESSENWEIN, PETER LIEBER. 

